原文：

之前，笔者写了《》。近日，有同事在对接遗留的Struts古董系统，需要使用Feign实现Form表单提交。其实步骤大同小异，本文附上步骤，算是对之前那篇的补充。

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• 添加依赖：

          
         
          io.github.openfeign.form
           
         
          feign-form
           
         
          3.2.2
         
        
          
         
          io.github.openfeign.form
           
         
          feign-form-spring
           
         
          3.2.2
         
        

• Feign Client示例：

  @FeignClient(name = "xxx", url = "http://www.itmuch.com/", configuration = TestFeignClient.FormSupportConfig.class)public interface TestFeignClient {    @PostMapping(value = "/test",            consumes = {MediaType.APPLICATION_FORM_URLENCODED_VALUE},            produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}            )    void post(Map
        
          queryParam);    class FormSupportConfig {        @Autowired        private ObjectFactory
         
           messageConverters;        // new一个form编码器，实现支持form表单提交        @Bean        public Encoder feignFormEncoder() {            return new SpringFormEncoder(new SpringEncoder(messageConverters));        }        // 开启Feign的日志        @Bean        public Logger.Level logger() {            return Logger.Level.FULL;        }    }}
         
        

• 调用示例：

  @GetMapping("/user/{id}")public User findById(@PathVariable Long id) {  HashMap
        
          param = Maps.newHashMap();  param.put("username","zhangsan");  param.put("password","pwd");  this.testFeignClient.post(param);  return new User();}
        

• 日志：

  ...[TestFeignClient#post] ---> POST http://www.baidu.com/test HTTP/1.1...[TestFeignClient#post] Accept: application/json;charset=UTF-8...[TestFeignClient#post] Content-Type: application/x-www-form-urlencoded; charset=UTF-8...[TestFeignClient#post] Content-Length: 30...[TestFeignClient#post] ...[TestFeignClient#post] password=pwd&username=zhangsan...[TestFeignClient#post] ---> END HTTP (30-byte body)

  由日志可知，此时Feign已能使用Form表单方式提交数据。

参考文档